Visible to Intel only — GUID: vgo1439183839152
Ixiasoft
Visible to Intel only — GUID: vgo1439183839152
Ixiasoft
3.1.2. Embedded Synchronization Format: Clocked Video Input
When in 10-bit mode, the IP cores ignore the bottom 2 bits of the TRS and XYZ words to allow easy transition from an 8-bit system.
Bits | 10-bit | 8-bit | Description |
---|---|---|---|
Unused |
[5:0] | [3:0] | These bits are not inspected by the CVI IP cores. |
H (sync) |
6 | 4 | When 1, the video is in a horizontal blanking period. |
V (sync) |
7 | 5 | When 1, the video is in a vertical blanking period. |
F (field) |
8 | 6 | When 1, the video is interlaced and in field 1. When 0, the video is either progressive or interlaced and in field 0. |
Unused |
9 | 7 | These bits are not inspected by the CVI IP cores. |
For the embedded synchronization format, the vid_datavalid signal indicates a valid BT656 or BT1120 sample. The CVI IP cores only read the vid_data signal when vid_datavalid is 1.
The CVI IP cores extract any ancillary packets from the Y channel during the vertical blanking. Ancillary packets are not extracted from the horizontal blanking.
- Clocked Video Input IP core—The extracted packets are produced through the CVI IP core's Avalon-ST output with a packet type of 13 (0xD).
- Clocked Video Input II IP core— The extracted packets are stored in a RAM in the IP core, which can be read through the control interface.